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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a8bf9179c673df22f638091687148e088fae6e0d16e5a5cac0db1cb13eb12a' 
  AND token = 'ICbMXnzD2nXsSJdezP3aVbUA7ztC66bBlFv8+RD8u08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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