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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853ac31bb39d38ab076b878f9d31e0641168b737f8af33fbd30d9848a50d1fc4' 
  AND token = 'pFHlAx4tVgSB9uhn/ZrWqfDErjmkeVQ7ajVWzrsT3cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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