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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ee8a9b6cd53c2d40232785cc53d47f8fe1a0d1c6e652c021d99ce20ef6234b' 
  AND token = 'V9X9oKzqBND/Fv2wP1zi6ozZBe/1S4MAkxG3yoAwCKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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