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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad093227cedfabeb7d16fdcc311a842fc9bd2c9fb8a2aa7628f7bc4e3f11381e' 
  AND token = 'ELjfQq49oq7bzwSc9zYAPoD94Ry+FpE7wDwKa3DAVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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