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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bae7d0bf0a78f41d0c80c1300f3de430227df29e0c1f8c6e5b3e1519f4bdccd' 
  AND token = 'aI43cK5WND8FGuNbp/KldRDIAvV71HVjkFRX2sE1Vg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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