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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87509588f7d032c6450fed35e7547d1184ce50d23ef73afcfb01e31e86d55f2d' 
  AND token = 'q61svXe8ptXdbVGRWAa0L4ScumFM9lR0Ytukweh/4sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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