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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d99662a9cf4ee5bce1b82aa658d2d708b2dcadb0a1c4c7a1260a55664ca304c' 
  AND token = 'v4blDdlkJG1IZW9A1kQengc0DprjIZh0lEh0giEpdUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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