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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0847459912cb4f2c2d1f8f47162ac8204c206724c6b67b9aa8004766dca4fae' 
  AND token = 'JSmiUFy6jQo0/Oft7wNGAnieBQgLP4dXyDikvnUoILU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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