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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbba774e70b07e3de572f16eaf7249c8cf71ced576335a433a445f7c4be7e18a' 
  AND token = 'BN1zt4n1Ts4lon+kq3NOBsJnzV1Wl+RYPgukoTCOTsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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