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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed31f043e0a3639ec4bf7939ac6ce43d5f869c8a5f16f6a4a182dc46acdf517c' 
  AND token = 'sNzy4k0KPTu/qQi2X1n5IkV9hdpVmv0iAKJhdS68d3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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