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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be5b6177dffab33b5351447a624ee00b26f94a0c60d559411ff9704db2a9d7d' 
  AND token = 'FZa2OwktNnluH5odjnYKsse6TO1sVJrnafrbEMcbTOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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