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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f1ff820df1e56424a0f022a003a088b3f43c0e402b31c353bfcbd4628fba5f' 
  AND token = '7E3yGTqcX9XeoZATPZN5BGJT0BCqCbxNPW4heGAyMps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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