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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f1745dbbe23a954228951bb4304d4efb4a565b0fc9e16982485dda52a8dfbe' 
  AND token = 'Ua9d5kL8WEqunU8dU+5vm4VplvDTb4jEItM2q3oZrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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