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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abba8283fc3f75aa119405d8b4458e13f7b9645f319b8884c9bc5ef1dd457185' 
  AND token = 'dFxbAfD2jxThsj0oS7JZljFTWVzq1BL0sxF3zuedjfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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