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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f165cdb372eacfe66fad194cee54db140abfebd119e23a2a9f557d000be965' 
  AND token = '8n7uq0W8ViEjoqn/yAwksjkqKC8f3bix26T0njXDSCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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