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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18230eeff68fa47f7981a6597db7582630c5c07de49098f252dde31107c77612' 
  AND token = '1CZbS8osPRuNT0De3Ud2bL5/5DNiIir06aTPcgJ5gX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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