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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f07d8a48f90d14b0a71e9b2d4b7ffd6ecaff5ecb47f328ca0b3d383ee0173b' 
  AND token = '7u3yHwoTsdxNs6LQ9SWlHOJRAJUkw4HzLUzM9C7/DPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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