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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae05e2eb7daeebe35a0b59433e0336ef9f261ff3460dc0a2fbd27f9f5c0cb20' 
  AND token = 'OMT52tdR1PjZUG/5V7FfRqc6TJQQve+WVNwR6M52rAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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