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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa6ab18ecd323d246980473f220511c15e735c8553150cd21ae28279195b7ce' 
  AND token = '6Ma7F1k2ZxV5EEqbwuY1iRVRnizIdm3m1h2sL/A/eT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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