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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb28fcd4a068979824a2e20a72c6c18f9dd77c06fc541d7918fca557659b856' 
  AND token = 'D+AKa8tmbHaCFKxNOlcK2odNT6TeSFLHUjFm2Ra7Veo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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