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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c0ad3cb6ae706b1dc2e7f14cf2c1074f27adb9e0cf42fc340bee3729f726e' 
  AND token = 'ras/afKEf8W9b4BvmbYlfFKp1aN+B2WZAtqYn//BI2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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