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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aeac48d8e1a4d01388ab7d5c5fed3cd6c4b3fa298ef39d9c1bbd8a196d7951' 
  AND token = 'GYNwmQYPhDHF3ID/3WGE6t0/asguVO5ZpaIDLMs+Rxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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