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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fc7f46d46bf8b5e287536b2b07feaea6f39c5f755ef38260b373425ad5d630' 
  AND token = 'MmL0pd5M2yeGJH+PzCu/caEmTc2BajE5s5BrOltXUtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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