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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb1e36587281fcc956b02a9395db97aa2b3b3f069f9a473a64ccb9b3ba97360' 
  AND token = '1j0y8SYVLtLmK89ORVififfP2SnqthXRHvjz7aq0H04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}