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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1190ddf09e0339748bef47a7af6622ea584a72a74d84ca53f7b7197e2f44e817' 
  AND token = '036MOkAzqr2D7pCYvhcuzTYKA4ObuNyJCRQTKXObaSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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