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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e785e16b45e1a6fda159ae721152bd8c24f4743d8aa7fed7496a1522aa9d9fc' 
  AND token = 'Yul482l4tJXJQ/vRNENzJHwytdBQ1t0gOwSEPt4lpnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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