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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3afd02345d23c769a6eeee32405eb827c74e457e4435431bb158beccaa52148' 
  AND token = '26emmzPZuteUXIlpRRCyi0sAbjcg0TEbaIxRIP0oVx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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