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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01e290c7a3727e5e2e9e3ba9a4eb307cfa9edf8f12d3e6142358b06137890c4' 
  AND token = 'cUJm8AuIe0hxfNhc1ZokTMMaGgCqbBJcZCSengPapWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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