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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cbb8f16e2b965f4f87f2d6d1ca728a8d97bcf41afb617a7224b4acf133d20' 
  AND token = 'jzuJbwMVx42Ja4nYwPa+HaLDRJ8PrBLSyldPp2eKlzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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