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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1eb22e2231070302476a5845f0796f9c17d5f2d3a3f35dd93bb334bc9cafc9' 
  AND token = '6x/pdXXtwfzCkCHq29EZQSwK9m7Ry6Z1KOKxDsqz9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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