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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01defaad5321055b3ee918cf40e727cf52243064e8a3f4ef8ad97958116f55d' 
  AND token = 'xkTGwGs6xig/+ciD3sK2/k3XJoAdXQgxxQrsM211rag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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