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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ab420cfb347b5d7213e35996150b710014b8c83efca3ff70ae328149f3d459' 
  AND token = '8yuesJN8yAaTjzzO2/FHmY4zhRMFgG3Oz9t4bsk3VtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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