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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c237ff19300ce7334e6d439fb0d8f6e7faae849eac095a7a52556e9c1ada111' 
  AND token = 'x0dRpNdi4+7soy0Hnw5Xf5XdOcn0Y7IXZdYfpqCZloA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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