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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae639dc2bc67178af66828de4873ce0b77694a775d15e8581fd8af9a9d4cc846' 
  AND token = 'YNVOH9E6//E3xskEAtnl6irEuzapu0zKZPdU05jL9XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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