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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d8a2303f4e0f09f9fa36b29619fe8a99ae27f321452e08703fff08e910b7bd' 
  AND token = 'X7hleuDCfO5cW9+w9DaAo3QBX0e4iEFVpp++qRYpR04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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