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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a1aa75c9881ef3b375494e2481d05cfc3b5ddc94d49c91dd2c79c9ff06dbd9' 
  AND token = 'IjE1Wffi8HIWcoh/UHgp5bpeKLzKqRb4zszUC4+HC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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