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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfd2a6b01806e19c058cbe7b8d2fae1db8febaa66fc0c1abe019aa21d3bd2c4' 
  AND token = '5XzTcHfi8yFwW3SOewjzyrfZVoEXzv/9mzNqHiybGqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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