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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbcabe6b080c154c704d28e17a5d759441286ffeccbae5c2bc5d63080dafaba' 
  AND token = 'AFxhmx18WOStKpoKSf/sbQvECrb6O7tyxKD+77ruezw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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