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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab27173a541228bd06dc1793c2c646142b6a5b9d58cb72c14cf94a21adea842a' 
  AND token = '5bHrqoSuowq9NxfqN1E6iyAK7d7y4PA+mUutyKhCovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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