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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98c548e3e0402d9d5bd2b9985ee87b35f0c79c42fd9850d35888e7f6355c121' 
  AND token = 'KJ5++jC10ferEsYteNpt4/qAyn9pwFGLaM77w384qFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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