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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a525ffa71c670d98bd35a4313b41d5f62833025aa2339d085f8129922a62cff9' 
  AND token = 'dIW61YIsyTflXKI39H7y19TfDTuVQm7n41W53dhTk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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