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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee7497feef80ea3d63ad17ec0ba5379b04d5a588a5e4db070a7db445ec42c10' 
  AND token = 'w5nCEtBC+L6JdmFd3AF3P29KbscLnKVaP6seRZPZlV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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