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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bba5f627c706d028712c5f3cdbdc5d679606054e089aa43bb58b771eadac94f' 
  AND token = 'BpYKHBRaNzaFd9+MbnsazkF7IK5R9TDGTq+J29Wxznw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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