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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4917ed2fc40b0f70d45980ac239bc51403f95ff503fe071e58cf98c44b57dacf' 
  AND token = 'Ov9L5osM5xJzERhOZIph0v3rHH4SN2jABr8O2l+xIec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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