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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad846f691622e9298485616f1f417919f13cce9dd2d8f50635d116ebc6a63d4' 
  AND token = 'rZ/iKHITEr5u5TfvZCkHNHEhBN1iJjTxTaGDXd52/7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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