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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da7331a91caa25acc1ac7e4c8d96ce96e271bef77f9b257cd60dd42a4b792ce' 
  AND token = 'H77mbyo/3B6RA8Io9PDl4+5VikH5KAOBGy8F8dhAkSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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