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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaeb84310f5df66d110c2017360ab9bae69807a0752dc773e53728fb8c76ed7' 
  AND token = 'Nd0jDNAiLwmDA3OJUIDF7Sp5sluG1wnMJC945lZQr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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