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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e658b4e55f56484dce3c928f9e8b188406374401f869b48819b514d2619ee8d' 
  AND token = 'F2Auxp1O0nYMsYhauFF9nUP1UlJDp4deYp4WTd7aOII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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