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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ed910c82d1da513f77d4efd3e4320a3b658810d21493e882e86cf3362f8047' 
  AND token = 'k3I/Ss3pHlSqb1GhzzP0/FCBMXSpFgY3TroarKdXixw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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