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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b24497e835fb133056fcc2fc605640815f69eaf75e3e317771f5cb582c265ba' 
  AND token = 'B3co+dVdhCTv4MH6VhC68Hqlt4k8Av9RS4Uy8x9Yj84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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