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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212d05fd10975ee41ede7426e0f7fed86be1587627a8a2798b7298d8365a5f3b' 
  AND token = '9fJLwPFD4jSmSDZ2mIzQm1GP7T7Os7GHCLqldTgsF5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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