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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e1da7e3acf716215668d3a2ab38f435af12d82004574d410ca114da7d2efe' 
  AND token = 'OGsQqbRiiyar1RGCoCYDl8PEUlSSakCVwjHaEdJPM6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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