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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a760c6460a5fb3e862dcb9db176dc3b701589eb152bac825d5e6672e28ce02b' 
  AND token = '4PZ3U9nhCUwsHcd9IAC1ZbSdCI4Yeab3amofcLq2s2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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