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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797203e1eb6f289aabd795425d3019f0ae5d00810f02a4ede713f8e32d787fab' 
  AND token = 'O9ewt6Efk6Jjfxdp4Yh9CuBh7v/LJGodOnoIUFTHENY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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