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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3b48079e1cc59b0d51663c72fdd0533a6881ee1f64be94368eeaef71b69ed7' 
  AND token = 'hlGQFnateMYpKYzXPHQ0jv4GomCCqkqidwTaGeUqNv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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