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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40133b501cbfbe48a8b3037ee1cff40e78d38d7d9be241e0664e84bc3eca417a' 
  AND token = 'T7O0IlT7QQjKSo2vfExPTkhBu1KhWynQvjw+aeZFxuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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