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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd680ca7f7b5c39d0222bac68b679d8f972d0fb49cb39fd42deeb37808826575a' 
  AND token = 'n1rwTmU83ygVxFr2B6yhTMX5Hde/RGxiTGVoh5idUiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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