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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69693e8ad3a093e9090ab3644ac623c31fc7cc3333f4091d565f61041206c4f4' 
  AND token = 'aLBapH91PX1Gr3hDKiTBQm1EopN+nvsr+8TbuuilTkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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