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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c83a7fe484c282a11df37177bd3f5721f16be1c86e436952cf507592c2f82e' 
  AND token = '/4kFyMfEJwqRQXRb8pX+hs4FZo7PIIAB5m5MQi43KrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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