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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407cdf8305e3680b71b7fdd1aae1aa6e21d368ae611f3ca93de67c0fb8c93fa0' 
  AND token = '/vYJ+1YJfYx+fiOf5sYEx8SxjiYqF022M7XEuASEnEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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