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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f46d3f526cad3fde19671eb12b08ab2bcaee6737774801a1624c74481371cb5' 
  AND token = 'x4rVrvKoFOmRPbAjh3wiRpAnXSKS1NHE5Oq8gwQceAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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